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From: Gerd Hoffmann <kraxel@redhat.com>
Date: Thu, 13 Nov 2014 15:56:24 +0100
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Subject: Re: [Qemu-devel] [PATCH v3 1/1] virtio: serial: expose a
 'guest_writable' callback for users
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To: Peter Maydell <peter.maydell@linaro.org>
Cc: Amit Shah <amit.shah@redhat.com>, =?ISO-8859-1?Q?Marc-Andr=E9?= Lureau <marcandre.lureau@redhat.com>, Amos Kong <akong@redhat.com>, qemu list <qemu-devel@nongnu.org>, Markus Armbruster <armbru@redhat.com>

On Do, 2014-11-13 at 14:52 +0000, Peter Maydell wrote:
> On 13 November 2014 14:47, Gerd Hoffmann <kraxel@redhat.com> wrote:
> > On Di, 2014-10-28 at 20:21 +0530, Amit Shah wrote:
> >> Users of virtio-serial may want to know when a port becomes writable.  A
> >> port can stop accepting writes if the guest port is open but not being
> >> read from.  In this case, data gets queued up in the virtqueue, and
> >> after the vq is full, writes to the port do not succeed.
> >>
> >> When the guest reads off a vq element, and adds a new one for the host
> >> to put data in, we can tell users the port is available for more writes,
> >> via the new ->guest_writable() callback.
> >>
> >> Signed-off-by: Amit Shah <amit.shah@redhat.com>
> >
> > What is the plan with that one?
> 
> It missed the hardfreeze deadline and is heading for 2.3 instead.

Sure, I didn't plan to squeeze it into 2.2, but the question remains
valid even when targeting 2.3 ;)

cheers,
  Gerd